The OPW 301 Emergency Vent is designed to prevent an aboveground storage tank from becoming over-pressurized by providing high-capacity venting in the event of a fire or blockage. The 301 is a weighted, mushroom-style emergency vent. </p><p>When the AST builds pressure, the weighted cast iron lid is forced up off its seat to relieve the pressure. When pressure is relieved, the lid lowers and is automatically reset. The OPW 301 Emergency Vent is available with female NPT, male NPT to allow for easy installation in new or existing aboveground tanks. Various lid pressure settings determine the initial venting of the valve. Other sizes are available contact a JME Sales Specialist for details at 800-333-3331.
Features
- Automatically Resets – The weighted cast iron cover reseats once the pressure in the tank is relieved.
- Aluminum Body and Cast Iron Lid
- Epoxy Powder-Coated Cover – Prevents rusting of the cover to protect expensive finishes on ASTs.
- UL Listed – To satisfy Third Party accreditation requirements of many jurisdictions.
- CARB Certified – AST Phase 1 Enhanced Vapor Recovery (EVR) System
Specifications
- For horizontal storage tanks
- 6 in. (152 mm) NPT
- 8 oz. pressure setting
- Vent capacity: 250,000scfh@2.5 PSI (0.17 bar)
- 5.9 in. ( 149.9 mm)H
- 8.1 in. ( 205.7 mm) W
- 20.9 lbs. (9.5 kg)
- Cast iron lid with powder-coated finish
- Aluminum body
- Zinc-plated steel shaft
- Buna-N O-Ring
- UL listed
- CARB certified
